import java.io.*;
//input all for reading line called "area"

public class pythontojava {
    public static void main(String[] args)
    throws IOException

 {
        //Setup input streams for reading a line
        InputStreamReader isr = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(isr);
        String input = "";
        int area = 0;
        double radius;

        System.out.println("Enter the area: ");
        //turn string into int
        input = br.readLine();
        area = Integer.parseInt(input);

        if (area > 0) {
            radius = Math.sqrt(area / Math.PI);
            System.out.println("The radius is " + radius);
        } else {
            System.out.println("Error: The area is invalid");
        }


    }
}
